Although they are expensive, I would suggest some BoP's. A cheaper alternative could be Skyshroud Elves (filters colorless into W or R without tapping)or Quirion Elves(choose a color when they CIP, t: make 1 mana of green or the chosen color). What about the lands that tap for green and can be sacced for another color (i think they're from Odysee.) Just a new guy's $0.02.

well, I´m not too impressed...(sorry)
You have 6 fatties, 4 of them being legends. Thats far too much.
Parallel evolution? This card is only good, if you are winning anyway. Same about saproling symbiosis. 4 hull breach and 2 artifact mutation seems a little too much. But your metagame might justify it. Goblin bombardment is nice ( but a goblin card... ), but it will be better combined with the most powerful saproling card, fecundity. I believe fecundity should be in any saproling deck. People WILL kill your saprolings!
Another thought -wouldnt a coat of arms usually be better, than doubbling your tokens?

I guess I could take out the Verdeloths, but I thought I couldn't play Fecundity. Tokens were removed from play when sacrificed or otherwised destroyed, not the graveyard, right?

As for killing the Saprolings, that's why I have the Bombardment, as a sort of fall-back if a swarm attack with Nemata doesn't work. That also explains the absence of Coat, though I could replace the lost Verdeloths with them.

So go with Fecundity? I'm confuzzled if Saproling Tokens would activate it. I was thinking of playing Collective Unconscious, but that might mill me if I'm not careful. (One game, I had 27 of the 1/1 beauties). Recycle?